Working & Episodic Memory
When solving a jigsaw puzzle, one creates a link between space and visual patterns using their working and long-term memory. After visual scanning the brain makes a mental note of the position and the pattern of the puzzle piece. The solver doesn’t intentionally try to remember the piece, it happens passively and eventually strengthens the neural pathway and neurons responsible for memory. If the puzzle is large and requires more then one sitting, the brain stores the information in the long-term memory and retrieves the same in the next sitting. All this happens without intentionally trying to do so.